It's a collimation Cap, so not a lot more I can say other than it worked as expected and the item arrived quickly with the usual great service from FLO.

Extremely fast delivery of a great little device that makes basic collimation a breeze!

Firstly, FLO service, perfect ad normal.

This Aline works well and does exactly what it claims. Easy to use, but still comes with instructions.

Works really well and makes the job a lot easier.

Been using a DIY collimation cap since I got my 200P and never been too happy that my collimation was any good. This turned up yesterday and it made the task so much simplere, the silver inside surface makes positioning the primary mirror centre spot very easy.

Using this I was easily able to collimated my Skywatcher 200P telescope

Another handy addition to any reflector telescope. Makes allinment of mirrors child's play. And of course, an excellent service from FLO as standard guaranties a speedy delivery in a secure package.

Good purchase fits snugly in eyepiece holder makes setting up secondary really easy,easy to align donut ring on primary on a Newtonian ,well made would recommend to collimate a Newtonian .

Ordered this and came almost straight away ,well packaged and it came with instruction easy to use. Also,is,silver on the inside which helps as the black cap can make it hard